(RFC6354 published August 2011)
Type names: audio, text
Subtype names: fwdred
Required parameters:
rate: as defined in [RFC4102].
pt: as defined in [RFC4102].
forwardshift: An unsigned integer can be specified as the value.
If this parameter has a value greater than '0', it indicates
that the sender of this parameter will use forward-shifting
with a base value as specified when sending out redundant data.
This value is in RTP timestamp units.
If this parameter has a value of '0', it indicates that the
sender of this parameter will not use forward-shifting when
sending its redundant data; i.e., the sender will have the same
behaviors as defined in RFC 2198.
Optional parameters:
ptime: as defined in [RFC4102] [RFC4566].
maxptime: as defined in [RFC4102] [RFC4867].
Encoding considerations:
This media type is framed binary data (see RFC 4288, Section 4.8)
and is only defined for transfer of RTP redundant data frames
specified in RFC 2198.
Security considerations: See Section 6 of RFC 2198.
Interoperability considerations: none.
Published specification:
RTP redundant data frame format is specified in RFC 2198.
Applications that use this media type:
It is expected that real-time audio/video, text streaming, and
conferencing tools/applications that want protection against
losses of a large number of consecutive frames will be interested
in using this type.
Additional information: none.
Person & email address to contact for further information:
Qiaobing Xie
Intended usage: COMMON
Restrictions on usage:
This media type depends on RTP framing, and hence is only defined
for transfer via RTP (RFC 3550 [RFC3550]). Transfer within other
framing protocols is not defined at this time.
Author:
Qiaobing Xie
Change controller:
IETF Audio/Video Transport working group delegated from the IESG.